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There are many misconceptions about risks associated with radiation doses and Mayo Clinic wants patients to have the most accurate information, including when to have procedures with radiation, such as a CT scan, versus when to have magnetic resonance imaging (MRI) or other non-radiation tests.

Diagnostic radiologists and medical physicists at Mayo Clinic in Arizona have installed new CT scanners and software and implemented scanning instructions to lower the doses for more than 100 different CT protocols. Diagnostic radiologist Amy Hara, M.D., says doses have dropped more than 50 percent for several scan types.